Radha is drawing a dot Rangoli with chalk powder. She has 9 dots in a row. How many dots will her Rangoli have for r rows ? How many dots are there if there are 8 rows ? If there are 10 rows ?

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Solution

Number of dots in a row $= 9$
Number of rows is a variable $= r$
Total number of dots in $r$ rows $=$ number of dots in one row $\times$ number of rows $= 9 r .$
Total number of dots in 8 rows $= 9 \times 8 = 72$
Total number of dots in 10 rows $= 9 \times 10 = 90$

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Radha is drawing a dot Rangoli with chalk powder. She has 9 dots in a row. How many dots will her Rangoli have for r rows ? How many dots are there if there are 8 rows ? If there are 10 rows ?

Number of dots in a row =9Number of rows is a variable =rTotal number of dots in r rows = number of dots in one row × number of rows =9r.Total number of dots in 8 rows =9×8=72Total number of dots in 10 rows =9×10=90

Number of dots in a row $= 9$
Number of rows is a variable $= r$
Total number of dots in $r$ rows $=$ number of dots in one row $\times$ number of rows $= 9 r .$
Total number of dots in 8 rows $= 9 \times 8 = 72$
Total number of dots in 10 rows $= 9 \times 10 = 90$